Multiple driver IC back light unit and liquid crystal response timing for LCD for virtual reality

Abstract

A display device that includes a liquid crystal (LC) panel, a back light unit (BLU), a first data driver, and a second data driver. The back light unit (BLU) emits light during an illumination portion of a frame period and does not emit light during a remaining portion of the frame period. A first data driver writes data to a first portion of the pixels of the LC panel. A second data driver writes data to a second portion of the pixels of the LC panel. The first and second data drivers write data at an overlapping time during a write portion of the frame period. The write portion overlaps in time with the remaining portion of the frame period during which the BLU does not emit light.

What is claimed is: 
     
       1. A display device comprising:
 a liquid crystal (LC) panel including a plurality of rows of pixels in a pixel area including a first row and a last row; 
 a back light unit (BLU) configured to emit light, the BLU emitting light during an illumination portion of a frame period and not emitting light during a remaining portion of the frame period; 
 a first data driver configured to write data to a first portion of the pixels of the LC panel; and 
 a second data driver configured to write data to a second portion of the pixels of the LC panel, wherein the first and second data drivers write data at an overlapping time during a write portion of the frame period, the write portion overlapping in time with the remaining portion of the frame period during which the BLU does not emit light, wherein liquid crystal material in one or more rows of the pixels transitions during the illumination portion of the frame period at an end of the frame period. 
 
     
     
       2. The display device of  claim 1 , wherein the write portion occurs during an entire frame period. 
     
     
       3. The display device of  claim 1 , wherein the liquid crystal material in the last row of the pixels completes transition after an end of the write portion of the frame period and before an end of the frame period. 
     
     
       4. The display device of  claim 3 , wherein the liquid crystal material in the first row of the pixels completes transition after the end of the write portion of the frame period and before the end of the frame period. 
     
     
       5. The display device of  claim 4 , wherein the frame period is 11 milliseconds, the write period is 5 milliseconds, and the illumination period is 2 milliseconds. 
     
     
       6. The display device of  claim 1 , wherein the first data driver and the second data driver are located on a same side of the pixel area. 
     
     
       7. The display device of  claim 1 , wherein the first and the second data driver write data to the LC panel from the first row to the last row of the pixels. 
     
     
       8. The display device of  claim 7 , wherein the LC panel includes a plurality of columns of the pixels and the first portion of the pixels are in a first half of the columns and the second portion of the pixels are in a second half of the columns. 
     
     
       9. The display device of  claim 8 , wherein the first half of the columns are even columns and the second half of the pixel columns are odd columns. 
     
     
       10. The display device of  claim 1 , wherein the first data driver and the second data driver are located on opposite sides of the pixel area. 
     
     
       11. The display device of  claim 1 , wherein the first portion of the pixels include a top half of rows of the pixels in a top half of the pixel area and the second portion of the pixels include a bottom half of rows of the pixels in a bottom half of the pixel area. 
     
     
       12. The display device of  claim 11 , wherein the first data driver writes data from a bottom row of the top half of the rows to the first row of the LC panel and the second data driver writes data from a top row of the bottom half of the rows to the last row of the LC panel. 
     
     
       13. A method of displaying an image by a liquid crystal display device, the method comprising:
 emitting, by a back light unit (BLU), light during an illumination portion of a frame period and not emitting light during a remaining portion of the frame period; 
 writing, by a first data driver, data to a first portion of pixels of a liquid crystal (LC) panel; 
 writing, by a second data driver, data to a second portion of the pixels of the LC panel, wherein the first and second data drivers write data at an overlapping time during a write portion of the frame period, the write portion of the frame period overlapping in time with the remaining portion of the frame period during which the BLU does not emit light, wherein liquid crystal material in one or more rows of the pixels transitions during the illumination portion of the frame period at an end of the frame period. 
 
     
     
       14. The method of  claim 13 , wherein:
 the first data driver and the second data driver are located on opposite sides of a pixel area on the LC panel, 
 the LC panel includes a plurality of rows of the pixels including a first row and a last row of the pixels; 
 the first portion of the pixels include a top half of rows of the pixels in a top half of the pixel area and the second portion of the pixels include a bottom half of rows of the pixels in a bottom half of the pixel area, 
 the first data driver writes data from a bottom row of the top half of the rows to the first row of the LC panel, and 
 the second data driver writes data from a top row of the bottom half of the rows to the last row of the LC panel. 
 
     
     
       15. The method of  claim 13 , wherein:
 the first data driver and the second data driver are located on a same side of a pixel area of the LC panel, 
 the first and the second data driver write data to the LC panel from a first row to a last row of the pixels, 
 the LC panel includes a plurality of columns of the pixels and the first portion of the pixels are in a first half of the columns and the second portion of the pixels are in a second half of the columns, and 
 the first half of the columns are even columns and the second half of the pixel columns are odd columns.